HYBRID SHEARWALL SYSTEM — SHEAR STRENGTH AT THE INTERFACE CONNECTION

Based on a series of alternating, displacement-controlled load tests on ten one-third scale models, to study the behaviour of the interface of a hybrid shear wall system, it was proved that the concept of hybrid construction in earthquake prone regions is feasible. The hybrid shear-wall system consists of typical reinforced concrete shear walls with composite edge members or flanges. Ten different anchorage bar arrangements were developed and tested to evaluate the column-shearwall interface behaviour under cyclic shear forces acting along the interface between column and wall panel. Finite element models of the test specimens were developed that were capable of capturing the integrated concrete and reinforcing steel behaviour in the wall panels. Special models were  developed to capture the interface behaviour between the edge columns and the shear wall. A comparison between the experimental results and the numerical results shows excellent agreement, and clearly supports the validity of the model developed for predicting the non-linear response of the hybrid wall system under various load conditions

Výtlačné ústrojí na výtlačném a sázecím stroji u KB s pecemi P 1

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Thin-walled curved bars with rigid closed section

summary:In the case of bars with curved plan there exists an unseparable connection between logitudinal deformation and the bending in the plane of the bar and between the bending normal to the plane of the bar and the bounded torsion. In the paper the solution for both these cases is given together with a detailed discussion of boundary conditions for various types of bedding of the ends of the bar

Bridge Structures of Linear Precast Elements (History, Present, the Design of New Precast Element)

Tento příspěvek se zabývá popisem vybraných mostních nosných konstrukcí z tyčových prefabrikátů (z pohledu historie, současnosti, perspektiv uplatnění). V závěru článku je uveden popis nového typu připravovaného prefabrikátu.This report deals with the description of the selected bridge structures of linear precast elements (with regards to history, present, perspektive, applications). In the conclusion, there is the description of the design of new precast element

Remedial Works and Repairs of Historical Bridge in Prague

The recent reconstruction of the historical masonry Charles Bridge in Prague was designed with respect to original conception, materials and ancient construction techniques. The repair and remedial works were based on analysis of the multi-decade response of the bridge, diagnosis, and assessment of damages, failures and deterioration processes related to materials, environment, climate, structural arrangement and detailing regarding heritage, historical and structural aspects. The gentle way of remedial works with minimal intervention in the loadbearing structure is a result of a wide-range discussion on appropriate strategies for refurbishment, restoration, conservation and preservation corresponding to location and significance of the historic bridge. The reconstruction increased durability and provides a long service life of the historical bridge and protection against harmful effects for many years to come. The article outlines historical data, consequences of the controversial reconstruction in the second half of the last century. Effects of river flow, temperature, and moisture and their influence on needful repairs are considered. Stages of reconstruction are presented; in the first stage, strengthening of foundations of bridge piers is described including historical background and impact of river flow on subgrade of piers. Ways of repairs and reconstruction of the bridge deck, its draining, and other related bridge elements are shown as a part of the second stage of reconstruction