Ribbed Slab Lightweight Frame Structure Mechanical Performance Analysis And Its Calculation Method

It has been a trend for developmen of modern structure to diminish sole weight of abuilding, promote its antiseismic capacity, enhance its heat preservation and energy-savingeffect, and simplify the construction method. In this paper, load carrying mechanism,antiseisimic capacity, and design and calculation procedure of a new type of structure, lightweight frame structure of multi-ribbed wall panel, are studied with chief achievements asfollows:Firstly, effect of frame grids division, intersection reinforcement, strength of infill blocks,and portals on bearing capacity, stiffness, deformation, and failure characteristic is analyzed,and the cooperative behavior and load carrying mechanism of the wall panel's frame gridsand infill masonry blocks are studied with a practical mathematical formulation of stiffnessand bearing capacity of the multi-ribbed composite wall panel proposed on the basis of aserial of tests of multi-ribbed composite wall panel.In accordance with opening, yielding, and changing process of elast-plastic area under theeffect of both axial force and bending moment, the reinforced concrete member is dividedinto five areas along the length of it; the member's flexural stiffness in each area isconsidered to change linearly, and the element's stiffness matrix is formed by means ofsubsectional integration. Fiuite element model of infill masonry blocks is formed accordingto homogeneous plane structure, allowing for openings in the blocks, yielding process andrelease of stress after the block opens. And finite e1ement analysis of the wall panel iscarried out in terms of cooperation between the frame grids and the infill masonry blocks.A ten-story building model of light weight frame structure of multi-ribbed wail panel withratio 1:3 is studied through the pseudo-dynamic test. Dynamic behavior, earthquake responseand failure characteristic of the structure are analyed with the strength envelop andhysteretic mode proposed, and deformation characteristic, energy-consuming, andcollapse-resisting capacity are also studied. As what is shown in the test results, thisstructure's load carrying characteristic is between that of frame structure and shear wallstructure.Based on tests and research, cooperation of the hidden light weight frame and themulti-ribbed wall panel is studied with the concept of equal axial stiffness proposed and asimplified equivalent rigid frame-compressive diagonal strut model formed for practicalanalysis and calculation. On the basis of the above study, test models are calcuated andanalyzed; Frame-plane compound substructure computational finite element model that fitsthe structure system is proposed in terms of load carrying characteristic and texture of lightweight frame structure of multi-ribbed wall panel, and a space finite element program isworted out with -- rewt be tri out to coincme weu wt the test ~.Me. by utiltw ds W a gred ded Of ~is and talculedon Of the ealstingboons is ed Out and bo tw behavior and defOnnallon charWedc ofStrUAn under tw load and hOriZOthe wtc M are StUded. Ruls of inwtW MH Of M wt, boe pe of the tal Panat and the am maSOnybfock are gim DeSbo and COInwt method of the struan are ProPosed togtwwith som SUggestions.